573218561 has 4 divisors (see below), whose sum is σ = 573378132. Its totient is φ = 573058992.

The previous prime is 573218449. The next prime is 573218579. The reversal of 573218561 is 165812375.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 513249025 + 59969536 = 22655^2 + 7744^2 .

It is a cyclic number.

It is not a de Polignac number, because 573218561 - 2²⁶ = 506109697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (573214561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74270 + ... + 81623.

It is an arithmetic number, because the mean of its divisors is an integer number (143344533).

Almost surely, 2^573218561 is an apocalyptic number.

It is an amenable number.

573218561 is a deficient number, since it is larger than the sum of its proper divisors (159571).

573218561 is a wasteful number, since it uses less digits than its factorization.

573218561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159570.

The product of its digits is 50400, while the sum is 38.

The square root of 573218561 is about 23941.9832303007. The cubic root of 573218561 is about 830.6921023585.

The spelling of 573218561 in words is "five hundred seventy-three million, two hundred eighteen thousand, five hundred sixty-one".